I think fruit or veggie based treats are kind of a toss up with dogs
Bheka LOVES banana. I turned around one day to see a couple of peels on the floor and was like "What the heck?"
Apparently she had silently gotten on the counter and eaten 2 bananas, when I went to look for her she was up there trying to get a 3rd. I didn't even hear anything, she's stealthy for an 80 lb dog.
One of my mother in law's dogs won't even TOUCH fruit or veggies. The other dogs are scarfing them up and he'll be standing there knowing there's food but if you offer it he looks at you like "WTF is this? That's not meat. Are you nuts?"